Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6035952 | Closed loop fluid-handling system for use during drilling of wellbores | David Preston Cummins, Phillip J. Bridger | 2000-03-14 |
| 5857522 | Fluid handling system for use in drilling of wellbores | David Preston Cummins, Philip J. Bridger | 1999-01-12 |